Citation: Jie LU, Jie KE, Bu Xing HAN, Hai Ke YAN. Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide[J]. Chinese Chemical Letters, ;1997, 8(4): 327-330. shu

Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide

Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080

Received Date: 21 October 1996

Fund Project: Financially supported by NMFSC.

The enol contents and equilibrium constants for keto-enol tautomerism of ethyl acetoacetate in supercritical (SC) CO₂ with and without cosolvent ethanol and in various liquid solvents were investigated by UV spectroscopy.The local dielectric constant about the solute in SC CO₂/ethanol system was obtained through the correlation between Gibbs free energy of tautomerism and Onsager-Kirkwood solvent quantin.The great difference between local dielectric constant and that calculated from homogeneous dielectric medium theory suggests clustering of the cosolvent around the solute.
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